The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 08, 1987
Filed:
Oct. 07, 1985
Metallgesellschaft Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
In a light alloy piston each of the load-carrying skirt surfaces is divided by a depression into two load-carrying partial shaft surfaces. In order to reduce the friction losses and the consumption of lubricant the depth of the depression (8, 9) between the tapered portions of the curved generatrix (7) at the top and bottom ends of the skirt is approximately twice the peak-to-valley height of the machined surface of the skirt (1). The load-carrying partial skirt surfaces (10, 11, 12, 13) and the depression (8, 9) are at least as wide as the wear pattern area, and the axial extent of the depression (8, 9) is so selected that the depression will not protrude from the cylinder when the piston is at its lower dead center and in the cold engine the load-carrying partial skirt surfaces (10, 11, 12, 13) have between the upper limit of the depression and the lower limit of the tapered portion of the curved generatrix (7) at top end of the skirt an axially parallel portion in a height of 1.5 to 4.5 mm, preferably 1.5 to 2.5 mm.